Isolated Passage - Castle B1 (Resident Evil Village - Shadows of Rose)

On the west side of the passage, wrapped around a vase.

Inside the vase that is protected by the Sclerotia on the west side of the passage. You need to use Rose's powers to acquire it.

On a wooden box at the east end of the passage.

On the statue at the east end of the passage.

Appears from the liquid void at the east end of the passage after you have picked up the Silver Mask.